I'm going to chime in on this and piggy back on what cloud is saying to OP. Unless you're willing to put in the work to completely overhaul the sprites you are editing, edits will not serve any purpose to make you stand out as an artist at your level.
And you know I'm not saying this to be mean but to be frank, any 8th grader can grab sprites from the resource and edit them. We've literally all done it at some point in our lives.
Do some research on other sprite styles, maybe look at some of the mickey mouse games and take what you've learned from the sonic advance style. Then once you get a good grasp on what styles you like take what you can to learn visually from them and start over with something from scratch. But please, for the sake for your own self OP, don't use another sprite as a base to edit off of unless you absolutely know what you are doing, you might just find that you don't need to do that later on when you start doing everything with out that crutch.
And you know I'm not saying this to be mean but to be frank, any 8th grader can grab sprites from the resource and edit them. We've literally all done it at some point in our lives.
Do some research on other sprite styles, maybe look at some of the mickey mouse games and take what you've learned from the sonic advance style. Then once you get a good grasp on what styles you like take what you can to learn visually from them and start over with something from scratch. But please, for the sake for your own self OP, don't use another sprite as a base to edit off of unless you absolutely know what you are doing, you might just find that you don't need to do that later on when you start doing everything with out that crutch.